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A291089 a(n) = A026520(2n+1). 3
1, 4, 20, 104, 556, 3032, 16778, 93872, 529684, 3008864, 17184188, 98577712, 567591142, 3278348608, 18986482250, 110217131168, 641125473092, 3736134109936, 21807240851480, 127469052615104, 746057665449076, 4371699398312704, 25644387465768860 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Lars Blomberg, Table of n, a(n) for n = 0..500

CROSSREFS

Cf. A026520, A291088.

Sequence in context: A035028 A104550 A089382 * A192619 A026305 A195256

Adjacent sequences:  A291086 A291087 A291088 * A291090 A291091 A291092

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 19 2017

EXTENSIONS

a(15)-a(22) from Lars Blomberg, Sep 01 2017

STATUS

approved

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Last modified November 11 18:50 EST 2019. Contains 329031 sequences. (Running on oeis4.)